<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>入门案例</title>
    <style>
        body{
            background: url("https://scpic3.chinaz.net/Files/pic/pic9/202011/apic29284_s.jpg" );
        }
        h1{
            color: greenyellow;        /*字体颜色*/
            font-size: 100px;     /*字体大小*/
            font-family: 微软雅黑;/*字体设置*/
            text-align: center;  /*字体居中*/
        }
    </style>
</head>
<body>
<h1>天天向上</h1>            <!--标题-->
</body>
</html>